216919712 has 12 divisors (see below), whose sum is σ = 427060746. Its totient is φ = 108459840.

The previous prime is 216919699. The next prime is 216919727. The reversal of 216919712 is 217919612.

216919712 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 210946576 + 5973136 = 14524^2 + 2444^2 .

It is a super-2 number, since 2×216919712² = 94108322908325888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389339 + ... + 3389402.

Almost surely, 2^216919712 is an apocalyptic number.

It is an amenable number.

216919712 is a deficient number, since it is larger than the sum of its proper divisors (210141034).

216919712 is an equidigital number, since it uses as much as digits as its factorization.

216919712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6778751 (or 6778743 counting only the distinct ones).

The product of its digits is 13608, while the sum is 38.

The square root of 216919712 is about 14728.1944582491. The cubic root of 216919712 is about 600.8503793740.

The spelling of 216919712 in words is "two hundred sixteen million, nine hundred nineteen thousand, seven hundred twelve".